Tonight's update is a complete overhaul of how repeating products are detected, so that you must always build 6 "repetition units", where one repetition unit is shown in the products tray to the left. The requirement that you build the "bonds to the right" has been removed, although you may need to build extra product if your repetition units don't align with the repetition units in the puzzle definition.
In general this change should improve your cycle scores on repeating product puzzle across the board, but it's possible that some old top scores are no longer possible, requiring them to be purged from the histograms and/or leaderboards. We'll see.
If you're a repeating product expert, please throw your solutions at the new implementation and let me know if you see anything weird. The best way to do this is to email me directly ([email protected]) and attach any supporting puzzles and/or solutions that illustrate what you're seeing. It's also possible that this change allows invalid products to register as valid, so if you see any of those please let me know!
Also, and totally unrelated, this update also changes the fast-forward key from Alt to 3 on Linux, because apparently Linux users can't click on things while holding the Alt key.