Thumbnails Render Dark For EXR Files

This has been going now for like 4 years I think... anytime you want to preview a directory of EXR files, the thumbnails are rendered too dark. The FIX seems to be to toggle the Preview Size setting in the upper right hand drop down to any settting and then back. Then purge the thumbnail cache. The new thumbnails are then rendered correctly. The problem is that rthis must be done everytime you restart Bridge. Please fix this annoyance!