Thanks. This may or may not be related to the other issue because it was happening before and after I replaced the exe file.
To be specific, I have a numbered series of a project ranging from copy1 to copy17.
On my 64 bit laptop they all open fine in X1exp-32 bit and X1exp-64 bit.
In X2a-64 bit numbers 1 thru 14 open fine but 15 thru 17 will not open.
In my previous post I suspected the exe file to be corrupt because colors weren't displaying right. After replacing it with the backup copy they worked fine and these projects opened as well... but only once.
I wonder if it's a registry issue. I'd hate to have to wipe X2 clean and start over but I might.