I presume you're using the new MTP support and not connecting the SD card directly to the computer.
You can return MTP support to how it was in 10.2 by setting Preferences / Miscellaneous / Advanced: mtp_enable to False.
We don't currently have a Galaxy Tab 7.7 to test with, and some Android devices seem to have wildly different implementations of the MTP protocol so there may be problems with some of them that neither we nor any other users have seen/reported yet.
Disabling anything in the lister that reads files in the background may help with some devices. e.g. Turn off the Description column and anything else that displays image dimensions, etc. Avoid thumbnails mode.
We've tested with a few different Samsung devices now and they work, but there seems to be a lot of variety out there (and the MTP stacks in both Windows and Android are unreliable themselves; even when using Windows Explorer I had to re-plug or even restart my phone/tablet several times) so it's difficult to make it perfect with every device & firmware.
If setting MTP_Enable=False makes it work then you should use that, at least for now.