It seems that MacFuse can cause crashes on Forklift2 while you update your OS to LION version.
I got this
Process: ForkLift [68711]
Path: /Users/USER/Downloads/ForkLift.app/Contents/MacOS/ForkLift
Identifier: com.binarynights.ForkLift2
Version: 2.5 Beta 4 (540)
Code Type: X86-64 (Native)
Parent Process: launchd [266]
Date/Time: 2012-04-07 19:14:40.278 +0200
OS Version: Mac OS X 10.7.3 (11D50d)
Report Version: 9
Interval Since Last Report: 567 sec
Crashes Since Last Report: 4
Per-App Crashes Since Last Report: 2
Anonymous UUID: 8A36E98B-7F21-48FA-9860-6CC1BC314D2F
Crashed Thread: 0
Exception Type: EXC_BREAKPOINT (SIGTRAP)
Exception Codes: 0x0000000000000002, 0x0000000000000000
Application Specific Information:
dyld: launch, loading dependent libraries
Dyld Error Message:
Library not loaded: /usr/local/lib/libfuse_ino64.2.dylib
Referenced from: /Library/Frameworks/MacFUSE.framework/Versions/A/MacFUSE
Reason: image not found
Binary Images:
0x10aa98000 - 0x10ab61fff +com.binarynights.ForkLift2 (2.5 Beta 4 - 540) <90432FE9-7366-3E9F-A35F-591DADF96A4B> /Users/USER/Downloads/ForkLift.app/Contents/MacOS/ForkLift
0x10ac2d000 - 0x10ac3cff7 +com.google.MacFUSE (2.0.3 - 2.0.3) <1968CCFF-4844-524C-AAE8-413243679F56> /Library/Frameworks/MacFUSE.framework/Versions/A/MacFUSE
0x10ac4a000 - 0x10ac79fff +com.growl.growlframework (1.3.1 - 1.3.1) <81F2E452-20C8-3F2D-94B2-B58FA5DE1ECE> /Users/USER/Downloads/ForkLift.app/Contents/Frameworks/Growl.framework/Versions/A/Growl
0x10aca1000 - 0x10ad19fff +com.binarynights.FLCore (2.0.6 - 1) <80F41E97-BDD6-3B3B-97D6-5A844F27DADE> /Users/USER/Downloads/ForkLift.app/Contents/Frameworks/FLCore.framework/Versions/A/FLCore
0x10ada3000 - 0x10b085fff com.apple.security (7.0 - 55110) <252F9E04-FF8A-3EA7-A38E-51DD0653663C> /System/Library/Frameworks/Security.framework/Versions/A/Security
0x10b1a5000 - 0x10b1aafff +org.sbooth.CrashReporter (??? - 1.0) <C715CEC4-E80D-C283-B393-858D27565F0A> /Users/USER/Downloads/ForkLift.app/Contents/Frameworks/SFBCrashReporter.framework/Versions/A/SFBCrashReporter
0x10b1b6000 - 0x10b1cdfff +org.andymatuschak.Sparkle (1.5 Beta 6 - 313) <9253F8F7-250B-1114-7AE9-A10A54EB2298> /Users/USER/Downloads/ForkLift.app/Contents/Frameworks/Sparkle.framework/Versions/A/Sparkle
0x10b1ec000 - 0x10b1fdfff +org.mozilla.universalchardet (??? - 1.0) <7CAA7A15-2B36-39D5-9910-7849C4874A92> /Users/USER/Downloads/ForkLift.app/Contents/Frameworks/UniversalDetector.framework/Versions/A/UniversalDetector
0x10b214000 - 0x10b2cfff7 +de.dstoecker.xadmaster (??? - 2.7 [libxad 13.0, modified]) <85EED6E9-A21A-3777-B9B2-EFF40D94D8D0> /Users/USER/Downloads/ForkLift.app/Contents/Frameworks/XADMaster.framework/Versions/A/XADMaster
0x10b37e000 - 0x10b3abfe7 libSystem.B.dylib (159.1.0 - compatibility 1.0.0) <7BEBB139-50BB-3112-947A-F4AA168F991C> /usr/lib/libSystem.B.dylib
0x10b3bf000 - 0x10bfc3fff com.apple.AppKit (6.7.3 - 1138.32) <A9EB81C6-C519-3F29-89F1-42C3E8930281> /System/Library/Frameworks/AppKit.framework/Versions/C/AppKit
0x7fff6a698000 - 0x7fff6a6ccbaf dyld (195.6 - ???) <0CD1B35B-A28F-32DA-B72E-452EAD609613> /usr/lib/dyld
0x7fff8772b000 - 0x7fff8772bfff com.apple.ApplicationServices (41 - 41) <89B6AD5B-5C75-3E83-8C2B-AA7F4C55E400> /System/Library/Frameworks/ApplicationServices.framework/Versions/A/ApplicationServices
0x7fff895e7000 - 0x7fff89786fff com.apple.QuartzCore (1.7 - 270.2) <F2CCDEFB-DE43-3E32-B242-A22C82617186> /System/Library/Frameworks/QuartzCore.framework/Versions/A/QuartzCore
0x7fff8a12b000 - 0x7fff8a444ff7 com.apple.Foundation (6.7.1 - 833.24) <6D4E6F93-64EF-3D41-AE80-2BB10E2E6323> /System/Library/Frameworks/Foundation.framework/Versions/C/Foundation
0x7fff8ac13000 - 0x7fff8acf7e5f libobjc.A.dylib (228.0.0 - compatibility 1.0.0) <871E688B-CF57-3BC7-80D6-F6476DFF109B> /usr/lib/libobjc.A.dylib
0x7fff8d9b5000 - 0x7fff8d9b5fff com.apple.Cocoa (6.6 - ???) <7EC4D759-B2A6-3A99-AC75-809FED1500C6> /System/Library/Frameworks/Cocoa.framework/Versions/A/Cocoa
0x7fff8db5f000 - 0x7fff8db5ffff com.apple.quartzframework (1.5 - 1.5) <2C13AE76-C86B-3D48-A583-121689190F74> /System/Library/Frameworks/Quartz.framework/Versions/A/Quartz
0x7fff8f2aa000 - 0x7fff8f2aafff com.apple.CoreServices (53 - 53) <043C8026-8EDD-3241-B090-F589E24062EF> /System/Library/Frameworks/CoreServices.framework/Versions/A/CoreServices
0x7fff8f9ec000 - 0x7fff8fbc0fff com.apple.CoreFoundation (6.7.1 - 635.19) <57B77925-9065-38C9-A05B-02F4F9ED007C> /System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation
0x7fff90e3e000 - 0x7fff90fc8ff7 com.apple.WebKit (7534.53 - 7534.53.11) <2969964C-2759-3407-9EBB-C1304A556755> /System/Library/Frameworks/WebKit.framework/Versions/A/WebKit
0x7fff937ce000 - 0x7fff938dafff libcrypto.0.9.8.dylib (44.0.0 - compatibility 0.9.8) <3A8E1F89-5E26-3C8B-B538-81F5D61DBF8A> /usr/lib/libcrypto.0.9.8.dylib
Model: MacBookPro5,1, BootROM MBP51.007E.B06, 2 processors, Intel Core 2 Duo, 2.53 GHz, 8 GB, SMC 1.33f8
Graphics: NVIDIA GeForce 9600M GT, NVIDIA GeForce 9600M GT, PCIe, 512 MB
Graphics: NVIDIA GeForce 9400M, NVIDIA GeForce 9400M, PCI, 256 MB
Memory Module: BANK 0/DIMM0, 4 GB, DDR3, 1067 MHz, 0x0198, 0x393955353432382D3034312E413031472020
Memory Module: BANK 0/DIMM1, 4 GB, DDR3, 1067 MHz, 0x0198, 0x393955353432382D3034312E413031472020
AirPort: spairport_wireless_card_type_airport_extreme (0x14E4, 0x8D), Broadcom BCM43xx 1.0 (5.100.98.75.19)
Bluetooth: Version 4.0.3f12, 2 service, 18 devices, 1 incoming serial ports
Network Service: AirPort, AirPort, en1
Serial ATA Device: Hitachi HTS543232L9SA02, 320,07 GB
Serial ATA Device: MATSHITADVD-R UJ-868
USB Device: Built-in iSight, apple_vendor_id, 0x8507, 0x24400000 / 2
USB Device: Android Phone, 0x0bb4 (HTC Corporation), 0x0ff9, 0x26200000 / 2
USB Device: Apple Internal Keyboard / Trackpad, apple_vendor_id, 0x0237, 0x04600000 / 3
USB Device: IR Receiver, apple_vendor_id, 0x8242, 0x04500000 / 2
USB Device: BRCM2046 Hub, 0x0a5c (Broadcom Corp.), 0x4500, 0x06100000 / 2
USB Device: Bluetooth USB Host Controller, apple_vendor_id, 0x8213, 0x06110000 / 4
just enought to update macFuse to 2.2 version






