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To clarify, this is a known problem with the HD version of the Hoya filters. Apparently it has caused some long-time distributors to rethink their relationship with Hoya. You rarely see comments like this from a shop that makes its money selling all kinds of filters"
B+W never cleaning issues, like Hoya MC filters, remember HMC in our opinion the hardest ever to clean and not just smear the dirt around
And they get even more explicit, if you have the patience to read through their ramblings
I knew of the problems with the 77mm HD filters, at some point multiple vendors including B&H stopped selling them until Hoya had a chance to review the situation. At the time it was believed that the smaller sizes were immune. I liked the low profile of the filter and the fact that they seemed to have solved the "stickiness" issue with their HMC coatings, so I bought a 67mm filter. Around 13 months later it fell apart in my hands, like the OP describes. I sent it to Hoya with a request for repair or replacement, they asked for $30. I told them to take the filter and shove it, and have promised myself to never give them another cent of business.
I like the optical quality of much of their stuff, particularly the ND filters that IMO are much better than B+W. However, the worksmanship leaves a lot to be desired. On at least half the Hoya filters I have owned the glass rattles in the fairly flimsy aluminum frame, and when the filter gets stuck and you apply a minor force trying to get it out the frame would flex making the situation even worse.
Do yourself a favor, write off the $100+ that you spent on a 77mm HD CPL as a "lessons learned" thing and never give them another dime.