I have the same problem. Win7x64 RTM.
The problem is with the NEW save as dialog, if using Word 2007 or any other app that uses the new dialog it happens. On older apps foe example polyedit (polyedit.com) that use the old save as dialog it DOES NOT HAPPEN.
As follows:, example with word
Create new folder, folder appears ready to input name
write new name, enter
folder appears as "new folder", "new folder 2"
it wont "take" the name
if i right click on it in the RIGHT pane and try to rename the same happens it does not "take"
IF I RIGHT CLICK ON IT IN THE LEFE OR TREE PANE AND RENAME, THE NAME TAKES OK BUT I HAVE TO CLIK ON OTHER FOLDER AND THEN ON THE NEW RENAMED ONE TO BE ABLE TO SAVE
Any Ideas ??? Please help