Not sure if anyone posted a solution, but here is my answer.
I was in the same situation as drakahn99, Hero Lab always works, works great, but now only would let me run one instance at a time. I've had multiple windows open and used it this way since it came out in 2009.
I'm running Windows 7. I verified that it was not a problem with my computer. Word, Excel, Notepad, Internet Explorer, all would open multiple windows.
On another computer, I verified that Hero Lab would allow me to open multiple instances.
After many experiments (including a complete re-install, I went through the menu items)
--> I had checked Tools/Diagnostics/Enable Debug Tracing
CHECKED - only one instance
UNCHECKED - as many instances as I choose to run
I hope this helps someone in a future web search.
Regards,
Todd
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