Good point from John Shriver, especially when I read the post linked by the OP...

'If the crystals loose the borax whitish look and become kind of transparent (metaborate crystals), you've overdone the hydroxide, and the solution pH will be higher than it should be.'


What was the pH of the developer you mixed in this 'strange' batch? A few pH test-sticks might be handy to keep things under control, as the perfect moment during the reaction may be difficult to judge without them.