I have a client with Windows 10 with ACT! v18. It was running great for months now when you start ACT! the ACT! splash window appears, the program appears behind it, then it all disappears within a second. ACT! (program) is not running in Task Manager.
I have uninstalled all security software (with a reboot) with the same result.
I tried Rebuilding the preferences file per: https://help.act.com/hc/en-us/articles/360024241154-How-to-rebuild-the-Act-Preferences-file
but get the same result
Any suggested remedies would be appreciated!