redmotionThis is quite strange...
Can you successfully use any other versions ? e.g. v1022-04...
Replacing all of the files shouldn't be necessary, BUT if you do it'd be everything in the
Octane sub-folder and its sub-folders... and the
Octane_loader.rb for completeness - though you'd get nothing if that file were broken!
If you are up to it, please close Sketchup, then 'Run...'
regedit and go to
HKEY_CURRENT_USER\Software\Google\SketchUp7... then find the entries for
WebDialog_Octane and
WebDialog_Octane_FolderBrowser and delete them both - these set the size of the dialog windows, which might have somehow become corrupted if as you say the dialog isn't a sensible size any more.
Then reinstall v1022-05 and try opening a SKP again...
Let me know how it goes...