Problem sending/receiving PMs with one particular user

Detailed Description of the Problem I seem to be unable to send or receive PMs from one particular user.  I sent him one and he says he never received it.  He then sent me one and I did not receive it.  Afterwards, I tried with a different user, and PMs worked fine.  It's been a couple hours since the failed messages were sent. In my private messages, I can see the message that I sent that the other user said he didn't receive. Steps to Reproduce the Problem Apparently, if I send a PM to the user with ID 1008242, or he sends one to me. Description of Your Setup (Browser + Version, Operating System, etc.) Firefox nightly (today's build), Windows 7.

I'm sorry to hear that you're having issues with the site.   My first thought is, "Did you block this user by accident?" which you can check by going to their user profile and checking under the user picture.  If that isn't the answer, then we turn to the standard troubleshooting list.  You'd be surprised at what little things can cause big issues, so would you please carefully work through the first three steps of our guide to Solving Technical Issues ? Step 1: Make sure to use the right browser Please check if these issues persist when using both Chrome and Firefox. Step 2: Ensure that there are no extensions/addons interfering with Roll20 Please disable all add-ons/extensions and anti-virus programs. Step 3: Clear your cache If none of the above succeeds, please thoroughly work through Step 4 . (Don't forget the complete Console Logs for both accounts, showing where you visit the private mailboxes for the account that CAN and the one who can NOT see private messages from this user!) Thank you!

Thanks for the response. #1: I just tried with Chrome v60.0.3112.113 and it's not any different.  As I mentioned, I use Firefox nightly, which is probably unsupported.  Installing the release version would be a hassle to test, unfortunately. #2: I don't think anything I have in Firefox would interfere, but with a blank profile (no addons), the message he sent doesn't appear for me.  In Chrome, I only have uBlock Origin.  I tried disabling it and it didn't change anything. #3: Clearing my cache didn't help. #4: In Chrome, with uBlock Origin off, there are absolutely no console messages generated if I log in, go to my PMs, and then even click on the message I see that I sent the other user except those that say "navigated to <URL>."  If I turn on uBlock Origin, I do get some messages about it blocking certain things. The other guy doesn't seem concerned by the PMs not working, so I don't know if I can get him to go through this.  I have uploaded my Chrome log including the stuff blocked by uBlock Origin anyway: Chrome console log

Alrighty, Devs have been pinged.  Hopefully they can fix this issue for you.  :)  And you're correct, Roll20 does not support the nightly builds, only the release builds.

According to the other user, he also sent me a PM.  I didn't receive one.