Weird error after updating to 1.8 beta

Question

I tried to login as an admin but all I get is the following that I do not even know how to debug. I also tried a clean install and I got the same error. 

Answer 1

Just switch the QA_HTML_COMPRESSION flag in your qa-config.php file.

Comments

The same problem happened to me as well. And thanks to @Scott it was resolved.
Although this issue never happened before Q2A 1.8, so some issue must be there which needs to be checked.

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I got the same problem testing in WAMP. This answer solved it.

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I think people are now updating there qa-config.php files by copy/pasting the example one rather than leaving it as it is (maybe due to the caching settings)

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In my case, I was testing in a brand new Q2A installation and database.