Reboot
Reboot MAY work, but only where the error appears after some time of normal behaviour. Reboot is necessary due to bad software design in that it degrades part of the resident OS.
However, if the error keeps repeating itself, continually rebooting treats the symtoms, not the underlying cause.
In one case of a negative balance, a player made a deposit and found the amount of the negative balance had been deducted, suggesting the error was on the server, and not a local display error due to "bad bits" or an old flash application.
"bad bits" can be caused by the "innoculate" function of some security software, and can only be cured by removing the innoculation. There is a special flash full removal tool that will remove any of these "bad bits" before installing flash player. Updating flash the normal way will not help.