White death screen on category blog page

I was sure that ths is an error wich newer come back to me - was a relatively common one in early 2010-s, since dissappeared from my radar. Today one of my former students approached me with his problem. He took over a site running the latest Joomla, and when tried to change the blog list views to category blog views, as the siteowner requested, the respective pages ended up with a white PHP fatal error death screen.

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Recently in more (usually cheap) hosts more of my clients reported a strange error, wich showed up recently, withouth notice.

The error message is like this:

1104 The SELECT would examine more than MAX_JOIN_SIZE rows; check your WHERE and use SET SQL_BIG_SELECTS=1 or SET SQL_MAX_JOIN_SIZE=# if the SELECT is okay

followed by the failing query.

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Today I had to upgrade an old, Joomla 2.5.7 site to latest Joomla, everything went out fine until I had to do the first critical step - the upgrade from Joomla 2.5.28 to Joomla 3.51. Did I mentioned that server has PHP 5.6.25 withouth possibility to upgrade - at least not on short term?

OK, so, wasn't the best setup condition available, but usually this is not a dealbreaker.

And BUMM, I have seen an old "friend", a popup saying:

ERROR: Invalid login

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... and does this randomly, both in frontend and backend, sometimes showing the correct pages, and rarely an error message saying, that "table '#__session' is marked as crashed and last (automatic?) repair failed".

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After updating K2 to version 3.6.3, in the backend, when tried to edit one of items, I got this error:

Error decoding JSON data: Syntax error.

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After upgrading to Joomla 3.6 I had a nasty surprise - in the Joomla Installer the tabs - Install from file,  Install from folder etc.., all but the Install from Web - where all gone. Of course, nothing found on the web: this happens when you are an early adopter. But I discovered the "fix" accidentally, on my own.

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