We're not aware of any compatibility issues with SSI Web and other software packages.
Many times when a user finds that the software "freezes" when a particular window is displayed, the dialog box is in fact being "displayed" on a second monitor that has been disconnected. If this could be the case, try one of the following:
(1) reconnect the second monitor
(2) while in the "frozen" state, hit Alt+Space on the keyboard, then hit the "m" key, then use the arrow keys to move the window back onto the main display
(3) if you're comfortable navigating the registry, run regedit and delete the key "HKEY_CURRENT_USER\Software\VB and VBA Program Settings\Sawtooth Software\CiW\Password Data Dialog". This will reset the location of the window display for the Password Data dialog box. There are keys for other dialog boxes located in ..\CiW, and they may be removed as well.