> Do you really think that google could deliberately disable Opera support due to some internal polytics and renounce from money of many opera users?

Yes. Google Docs officially does not support Opera. Not Gmail either. This was a policy change that happened some time ago.

Sources: http://docs.google.com/support/bin/answer.py?hl=en&answe... http://mail.google.com/support/bin/answer.py?hl=en&answe...

In my experience, both of these always work in Opera though, if you actually try.