Nothing should have changed for iPoker in 4.17.12, but you may need to set your configuration again.
Please try clicking Auto Detect in Configure > Sites & Import Options and that should detect your hand history folder.
If it doesn't, you can add the hand history folder manually and that should also get things working.
You may want to check your iPoker software to make sure that it is still configured to save hand histories as sometimes when your poker client updates it can cancel the saving of histories.
iPoker Configuration Guide