Thanks for reporting this problem!
I have verified the assertion in the Beta compiler, but the bug has already been fixed. Watch for the availability of an updated Beta release. (I can't give you the date yet.)
I am kind of stuck with this assertion error, and I am not sure what lines in my code I can change to work around it. (I do not use std::vector.) I see on the website the current beta release is mar14 which I am using. Is an updated beta coming soon?
Sorry, I can't suggest a workaround. The updated Beta will be available soon. Watch this forum for an announcement.