I was running the same version of 10.7, although I just upgraded to 10.8 this morning. Try this: Shutdown your mac, press the power button then begin holding the Option key. You will get several boot options. Choose to boot to the Recovery Partition.
Cisco Jabber 11.9.1 for Mac can be downloaded from our website for free. The software lies within Communication Tools, more precisely General. The software lies within Communication Tools, more precisely General. To install Cisco Jabber for Mac: On the Welcome page, click the Continue button. Click Continue, and then click on the Agree button. Cisco Jabber.app is the application. To install: Drag and Drop that Icon to your Applications folder. After it's in the Applications folder double click on it.
Once it boots up, click the Utilities menu at the top of the screen then choose Disk Utility. Select the partition of your hard drive that has Mac OS X installed on it, then on the right hand side there are several buttons. First click Verify Disk. If it comes back and says Disk needs to be repaired, click Repair Disk. If it says Disk is OK, Click Verify Permissions.
If there are any permissions errors that come back, click Repair Permissions. Once this is done, click on the apple menu and restart. Once it loads up, try running Jabber from your applications folder again. Adam, I think I'm just about out of ideas for this one. I've installed it on about 8 Macs here in the last week all running Lion with no problems. The only other thing I can recommend is remove the program completely ( any trace of it on your computer ), do a repair disk permissions again, and do a verify after the fact just to make sure there aren't any extra permissions needing repair, then restart and go download the program again from Cisco's web-site. Drag it to your applications folder and try again.
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Other than that, maybe try creating a second user account on your mac and seeing if it will install on that account? Otherwise, I'm fresh out of ideas. If that doesn't do it, i'm sorry I couldn't resolve your problem and wish you the best of luck! Thanks, Tony.