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Few years ago I was testing mysql and record locking - that was strange because on one my computer record locking worked OK, on another - with the same version of mysql - it wasn't working.
I wrote about it to author of harbour procedures to connect to mysql, but, he had any idea what's wrong.
I've left it after...

Concurrency issues were corrected in Mysql is more, MariaDB now has new storage managers fully opensource high performance, I drink it.
What to consider is the compatibility version of the static libraries that used the ld (linker) and the dynamic library (libmysql.dll) to use the application
libmysql.a version == libmysql.dll version.
In the event that there distinas versions are you generate them again using tools
impdef.exe, peexport.exe and dlltool.exe from the libmysql.dll