I have today had confirmation that a Dex Bug (mouse stops working) will be fixed in GPv10 SP4. SP4 will be released on August 1st, so if this has been frustrating you then please take this chance to get up to GP SP4.
It has been one of the weirdest issues I have seen in a long time, where if you have VBA files in your client install of GP, then every time you open a .net toolkit window (e.g. Data source screen in SmartConnect) then your mouse stops working!!!!
The Workaround has been to rename or move the VBA files temporarily, but this is not an ideal solution.
Thanks to Microsoft for getting this sorted.
I will blog more about other great reasons to get up to SP4 shortly.