I'd suggest giving it a try after the next update of Lacerte.

ProSeries moved to a much newer version of the component we share in our December 16th TY20 release. That addressed the login/blank screen issue for us, and should do the same for Lacerte when they release with it (which I believe should be their next release).  Hopefully this new version will address your issue. Unfortunately I don't have quite as nice a monitor, so I can't verify on my own.