Just got "trail" and "trial" and picked the wrong fifty/fifty... happened two other times but I didn't spot the second of the anagrams... (I had already confirmed the word I chose had exactly the correct letters) out of five games which gives a rate of 20% of lives lost due to this bug and about 3% of problems posed - I got to an average of about 20 puzzles solved in each run.
Great game though - still play regularly! :)