Thanks for the reports, we're looking into duplicating, finding, and resolving the issue with these ads.
To help troubleshoot, we need the following:
Browser / version
Location of the ad (on the page)
A screenshot of the ad(s) that are causing problems.
Thanks for the details, we're looking into it.
While we do know that ads do take a bit of the processing / bandwidth to load, we try to keep that to a minimum. We haven't been seeing any ads coming through that are causing mass problems for users, but we'll keep an eye on it.
Anybody else...