Long PW login time

Greetings,

We've recently upgraded to ALIM 16.9.9.9 / PW 10.00.03.453. We have a custom ALIM web plug-in that logs into ProjectWise via aaApi_Login() and downloads files. Post-upgrade, it now takes several minutes for the plug-in to log into ProjectWise. The login eventually succeeds, it just takes a long time.

After some investigation, I determined that if the web runs under an account with Administrator privileges, the login delay goes away. It only occurs when running as a limited rights user (DefaultAppPool, NETWORK SERVICE, etc.).

I created a small console app that logs into PW and exits and ran it as a limited rights user. I was immediately presented with this dialog:

I assume that this dialog is also coming up for the plug-in, but invisibly since it's running in Session 0, and is what's causing the login delay. How can I suppress it? I don't want to sign in via the Connection Client if at all possible since this isn't a user process.