Internal server error (500), yet pages of store load normally (...)

As the 500 error is no longer showing within the Headers, looks like disabling "Content-Encoding: gzip" solved that problem.

Sadly, you are correct.

The customer informed me that he isolated the problem in a plugin (probably badly coded one, might I add).

I just tended to believe that this was some deeper issue - which it wasn't.

Feel free to close this thread, since this obviously is not a bug of any sort - And I'd like to thank you all for the discussion, maybe it will prove useful to others experiencing similar plugin related errors! :smartalec:

It can be even more useful if you shared which plug-in was the offender.:yes:

Hello all,
I had the same problem, google just got 2500 error Internal server error 500 and I cant understand why becouse The page display without problem visible.
Well, had made some modifications on tpl_product_info_display.php and these modification crashed something.
I just restore this TPL and problem disapear.