In pre-7.5 Business Process Server versions, BP Server Admin used to do command parsing by using the StringTokenizier with double quotes and space as the delimiters. Therefore, whenever a double quote was used in an argument, pre-7.5 BP Server Admin treated it as the end of that argument. From 7.5, you can use double quotes in an argument for a BP Server command by using back-slash (\) as an escape character.
For example, if you want to enter argument jst.writeLog("Testing Log");, then it should be entered as jst.writeLog(\"Testing Log\");