Hi,

I'm have the same problem. I spoke with technical support but they said that it is not the fault of the software but my device (they not able to reproduce the problem on test router). They say me that I must send router to thier service, but I didin't do that. Now I waiting for the patch to fix the bug. TP Link Support go to work! ;) Polish customer service have a whole info.

Also, Is it possible to set up more than two user accounts in addition to "admin" and "guest"?

Yes, is possible.

Regards
Grzegorz

this is the first time that i am writing here..facing the same problem..with the latest FW
Firmware Version:
3.13.23 Build 121225 Rel.37950n
Hardware Version:
WDR4300 v1 00000000

once enabled password access , no system could access to the shared drive.
1) my win 7 notebook cant find the share drive.
2) my android file manager APP manager cant find the drive.

however FTP is working fine, the access right is going according to the users account setup, this proved that the user accounts information are setup properly.

This obviously is the bug in the new firmware..I have no choice but got to disable SMB Sharing..it is too risky to use No password access..