Created attachment 51379 [details] a sample .ods with thai sheetnames and a captured picture. If a thai sheetname contains any upper or lower vowel characters and is trailed with western numbers or character, Calc displays it incorrectly and unreadable. You can see in the attachment. My machine is Windows 7 SP1 32-bit. As far as I recall, 4.3RC2 doesn't have this problem. Regards, Sand.
Created attachment 51380 [details] Screen Capture
Created attachment 51381 [details] Sample .ODS with the issue.