Mahjong Sanctuary Level 431 shows 999 matches and won't let you select any

I am having the same problem with Level 431. I am using Firefox, Windows 10 and I have cleared cache, cookies, etc. to no avail. I have also attempted to play from the old site and on Chrome. It doesn't make any difference. I got it to load once from the new site by choosing games, mahjong, then mahjong sanctuary. When I failed to solve the puzzle and retry, it locks up with 999 showing in the moves. In fact, I have had it show 999 in the moves when it first opens the puzzle and then "blipped" to real number for the moves available. Two of us play this game in our house, and my partner got through 431 quite awhile back but  has run into levels in the Artic Biome that lock up in the same way - mostly when there were vines to cut. Something is going on with Sanctuary that has happened fairly recently for this to be locking up and we have found no way to consistently find a work around...and we shouldn't have to. Is there anyone looking into this? Thanks