Well just to check are your video drivers up to date?
So the software was working, then you started playing with some new packs and it stopped working. After you did the reinstall did you apply one of the base packs to see if it worked again? I went looking and I haven't found many cases like the one you described so far. Also in IconPackager, under Settings>System Settings you can use the 'Rebuild Icon Cache' and Repair Icon Images buttons, which could help with this issue. If not, try the Repair Shell Icons... button and select "Repair shell icons for all processes" and click OK.