Tim, unfortunately I can't increase memory limit, however, in my opinion, the log you're referring to, is not directly attributable to the problem I described, because this issue came up after september 5th.
Don't you rather think it could be something connected to Javascript? The problem basically involve the drag and drop option and drop-down menu function inside widget area. Moreover, if I set "Accessibility Mode" on widget page (under "Screen Options") everything works flawlessly, because the page turns to static.
"Scan image files as if they were executable" it isn't flagged.
Regards,
Christian