Ok. Update regarding my percieved success with Webrep. I was able to re-produce the gadget error. After uninstalling Optomize Google and Google doc's addons, as said, I re-enabled Webrep with no re-occurring error, went ahead and re-installed the two addons, still no error.
I then went to Ccleaner, and let it clean all (Have normally all Google cookies on exception from cleaning, because I am using iGoogle as homepage and vivid Gmail user)
As soon as cookies was cleared, the gadget error was back!
I am no programmer, so have no clue as to why webrep should be affected by cookies. But I am able to re-produce the error 100% this way.