Dozens of "Page Not Found" Watchdog errors with CSS_Embeded_Images enabled

Any update on this?

This is most likely a crawler (or even visitors on old browsers) and is not easily affected by this module. It might be possible to do user agent detection and rewrite rules in the web server config to force those clients to always fetch the original CSS, but that's going to be unique to your particular setup.

If you have web server logs of those requests to see the user agent, it might be helpful.

I just installed this module on D 6.14 and everything works fine - no errors in watchdog.

Hello. I found this thread while researching why I was getting this page not found on one site but not another. Didn't find any answers here or anywhere but I have solved my issue so thought I'd come back here and say how in case anyone else has similar problem.
My 'page not found' alerts where being generated by a particular page - a views built page that called in albums. In one of those albums in the description field using WYSIWYG editor someone had posted what looks to be a paste from another website which included three little icon links to youtube, Google search, and some other place.
That image/png;base64,iVBORw .. string is clearly generated by google I think. Deleting the content in that field resulted in no more of them being generated.
You can imagine how happy I am about that.
Hope this helps others.

Given that this is most likely a client that is unable to handle data URIs (or maybe something malicious, as in fluxrider's case), I'm going to have to mark this as designed.