report folders disappear off left Reports Folders menu

2 Report Folders I created appear just fine in the main list of All Reports.
But they do NOT appear in the REPORT FOLDERS left side menu.
All other folders do appear there.

BUT when I edit a report within one of the 2 folders that don't appear at left,
then SAVE REPORT it to one of those folders that do NOT appear,
all folders including the missing 2 DO appear in the left REPORTS FOLDERS menu,
and it highlights the report's folder at left as it should.

If I then click to Reports' home, the 2 folders again DISAPPEAR off the left Reports Folder menu,
but as I said in the beginning, those 2 missing ones do appear in the All Reports listing.

I see no where that I can affect that.

Build 7015.