Community OXtender Add-on crashes Thunderbird on OSX

[smartbrief]

I know the Thunderbird OXtender isn't made by Open-Xchange, but I haven't been able to get a response from their ticketing system and was hoping someone here had some insight. I'm using OSX 10.6.6, Thunderbird 3.1.9, Lightning 1.0b2, and OXtender 1.7.5-4. Syncing works, but I am having intermittant (5-6 times a day) crashes of thunderbird. Ususally Thunderbird will come back up and work fine for another while. Here is an error report if that helps. Let me know if more information would help.
Thanks,
John

Add-ons: {e2fda1a4-762b-4020-b5ad-a41df1933103}:1.0b2,{a62ef8ec-5fdc-40c2-873c-223b8a6925cc}:0.7.1,{E6050BDA-F130-11DD-8931-239656D89593}:1.7.5.8-MAC,{972ce4c6-7e08-4474-a285-3208198ce6fd}:3.1.9
BuildID: 20110303033424
CrashTime: 1299787709
EMCheckCompatibility: true
Email: user@smartbrief.com
FramePoisonBase: 00000000f0dea000
FramePoisonSize: 4096
InstallTime: 1299505590
ProductName: Thunderbird
ReleaseChannel: release
SecondsSinceLastCrash: 4251
StartupTime: 1299783502
Theme: classic/1.0
Throttleable: 1
Vendor: 
Version: 3.1.9