F-Droid doesn't start after update to version 0.102.3

today I updated F-Droid to the current version 0.102.3 on my CyanogenMod 7, and if I start it, it gets into a loop where it shows a grey screen for about one second and then gets back to the desktop and after about 2 seconds it shows the grey screen again. This loop continues until I press the “home” button and stop the process. So F-Droid is not usable now.

Any suggestions how to make it work again?