I tested some more. I was able to replicate the bug every time I started SimDash, until I configured the LFS plugin to have it display some data(which it did perfectly).
Afterwards, it didn't freeze on closing the window. However, after reinstalling and testing some more, it seems to occur randomly.
When I switch the Main/Simulator/Instruments tabs multiple times, it seems to occur more often.
The bug manifests like this: open SimDash, click view/data, the window opens, click the "red x" on the window, the data window closes. At this point the main simdash window is frozen, no mouseover effects on the tabs/menu, no response to clicking on anything including the close button. ALT-F4 doesn't work either at this point.
The only way I can exit is to "kill" the SimDash.exe process.
In addition I get the following error: "SimDash.exe has encountered a problem and needs to close. We are sorry for the inconvenience." sporadically whenever I close the program.