12.1: Open Tabs are Reordered Upon (Re-) Opening a Project

I always manually set the order of editor tabs. Since 12.1 came out, I'm noticing than when I re-open a project all the tabs are reordered.

I can't seem to find an option that might control this behavior. If there is one, please inform me. If not, I consider this a bug. In the past, tab orders were remembered and restored.

I use a vertically split editor window with tabs arranged vertically on the left of each editor pane.

IDEA: 12.1 #IU-129.161

OS: Mac OS X 10.7.5

Java: 1.6.0_43

Randall Schulz