I tried posting following message on Google Groups ( https://groups.google.com/forum/#!topic/moin-user/rtU-zD1U7Hw ), which I think is not the official mailing list. Any help/suggestions is highly appreciated. 

We have been using MoinMoin for more than 3 years for our website and it has been working nicely. However, in since couple of weeks we have started to get "Unhandled exception" while editing some pages of the website using GUI mode of the editor. Few other things have also stopped working, for instance copy-paste also seems to give "Unhandled exception" and "insert image" button is not available anymore. Temporarily, we have been editing the website using text-mode of the editor but we would like to get back GUI mode functionality. 

Is there any way to find the source of the issue and fix it? We are running MoinMoin 1.9.3 and Python 2.4.3. As far as we know, not much has changed in the configuration files. 

Also, is it possible that updating to a newer version of MoinMoin (and Python) can fix the issues? If so, then we would first like to test the installation/working of new version(s). Is it possible to install two versions of MoinMoin (and corresponding python) side-by-side on the same machine while not affecting the previous installation (and working) of the software(s). We do not want to take down the website while we are testing new version.