Yeah, they changed the algorithm again for like the umpteenth time. Look at the bright side: you won't be able to blow 50 or 100 points in one bad session nearly as easily. 
Tactics Trainer Rating
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Jan 1, 2014
0
#3
Tactics trainer rating!
This area has endless number of question marks.
(1) Lately I got incorrect from TWO exercises -the reason I finished with mate as correct but used a wrong piece (there were two pieces making the mate to choose and I did choose the wrong one?????)
(2) I studied from the list of high rated problems and found a problem with rating 2600 where you should only understand to move the queen to the open h-file where knight already protected the place for the mate??????
(There are MUCH more difficult problems on the 1100 rated list)
(3) Some players had something 3700-3800 tacics rating with few hunder of attemps alltogether and some 1500 live game elo ??????
AND SO ON...............
Jan 20, 2014
0
#4
Here's my two sad stories.
I take my time to get it right. After 4 minutes I solve it correctly and lose points for being too slow. Same for the next and the next. After aboout 30 minutes I see that I solved 8 of 10 problems and lost 50 points in the process. 
Second version. I get it right in 1:30 and gain 2 points. Next problem I get it right in 2:00 and gain 1 point. Third problem I get it right in :50 and gain 4 points. Next problem I miss it and lose 9 points. So I get 3 of 4 correct and lose 2 points for doing so. It happens all the time. 
JustADude80 wrote:
I get it right in 1:30 and gain 2 points. Next problem I get it right in 2:00 and gain 1 point. Third problem I get it right in :50 and gain 4 points. Next problem I miss it and lose 9 points. So I get 3 of 4 correct and lose 2 points for doing so. It happens all the time.
Happens all the time! So annoying.
Mostly I get +16 when I get a tactic correct (100%), but now only +8??