Has the 826L been factory reset and set up from scratch after the FW was updated?
For completeness sake tonight I:
1: Reset to factory defaults, and left all settings at their default.
2: Went to speedtest.net and both download and upload tests completed OK.
3: Enabled Access Control
4: Added Policy
Policy Name: Logall
Schedule: Always
Machine: my ip
Method: Log Web Access Only
Save
5: Again went to speedtest.net - download test OK, but upload test FAILED.
6: Reboot Router
7: Again went to speedtest.net - download test OK, but upload test FAILED.
8: Went to Access Control, disabled "Logall" policy (cleared checkbox on policy line).
9: Again went to speedtest.net - download test OK, and upload test OK.
10: Reboot Router.
11: Again went to speedtest.net - download test OK, and upload test OK.
12: Re-enabled policy
13: Tested gotomypc - got timeout errors
14: Disabled policy
15: Tested gotomypc - no errors.
It's not just gotomypc and speedtest, those are just the two most consistent tests for the problem I have found.