[Chimera-users] Chimera 1.2176: surfaces fail for some structures?

Hello, I have noticed that for 1.2199 version there is a "know bug" of surface failure. We have been working with 1.2176 version (which is probably even not release version). Apparently, I have the same problem with some of molecules (working with 1.2176). Is it occasionally or there is a "known bug" for 1.2176 too? Can you maybe recommend some version that has not such a problem? Thank you in advance! Sincerely, Anna.