Strategy Tester Symbol Drop Down Is Jittery

 

I have the forex.com version of MT4. and when trying to set the Strategy Tester, I find that the Symbol drop-down is "jittery" in that it keeps updating the list and rebuilding it to the bottom of the list. This makes it hard to select a Symbol higher up on the list because the list keeps updating itself rebuilding to the bottom.

Are there any settings that might alleviate this behavior?