Vienna no longer working after computer video card repair

[champacs]

My iMac (running El Capitan) came back from the repair shop yesterday after having a video card replaced.
Everything is working perfectly apart from Vienna, which is stuck on the RSS feeds from the day the computer crashed. (When I launch Vienna it seems to refresh all feeds but nothing new appears).
I've tried restarting the computer, uninstalling Vienna and re-installing it, but nothing works.
Can anybody help?
P.S. Vienna is version 3.1.5

[champacs]

I've solved the problem myself by deleting the preferences and application support files.