Major bug!
Using LR5 on PC / Win 7 Pro SP1 - In Library module, grid view, publish services, I noticed that the selections in the film strip and the grid view do not always concur. For example, if I select a published image, then (without holding down any modifying key) select an unpublished image, the initial published image remain selected. Doing the same, only on the published images (or the un-published images), seems to work as expected. I believe that I must have accidently deleted some images from my publish service from this bug, so it's a serious issue. It appears that the selections from the unpublished / published images are working independently.