Vassal 3.2.15 Suddenly Won't Load on Win 8.1

All of a sudden Vassal will no longer load. I had not updated or changed any programs or the operating system. I uninstalled and reinstalled the Vassal engine. Though only Java 6 was installed, & I confirmed it was working, I uninstalled it and installed Java 8. Then uninstalled and reinstalled Vassal again. I also turned my Firewall off completely, since there is no option to control the “feedback loop” in McAfee. But nothing works, I can’t get it to load. If I delete the v-Global file in prefs folder, or the entire c:\users\joe\appdata\roaming\VASSAL folder, will I make matters better or worse? Thanks for the help.
Versions:
Windows 8.1 64-bit
Vassal 3.2.15
Java 8.0450
Error Log:
2015-06-28 14:57:22,519 [0-main] INFO VASSAL.launch.StartUp - Starting
2015-06-28 14:57:22,534 [0-main] INFO VASSAL.launch.StartUp - OS Windows 8 6.2
2015-06-28 14:57:22,534 [0-main] INFO VASSAL.launch.StartUp - Java version 1.8.0_45
2015-06-28 14:57:22,534 [0-main] INFO VASSAL.launch.StartUp - VASSAL version 3.2.15
2015-06-28 14:57:22,816 [0-AWT-EventQueue-0] INFO VASSAL.launch.ModuleManager - Manager
2015-06-28 14:57:23,144 [0-main] ERROR VASSAL.tools.ErrorDialog -
java.lang.IllegalArgumentException: Malformed \uxxxx encoding.
at java.util.Properties.loadConvert(Unknown Source) ~[na:1.8.0_45]
at java.util.Properties.load0(Unknown Source) ~[na:1.8.0_45]
at java.util.Properties.load(Unknown Source) ~[na:1.8.0_45]
at VASSAL.preferences.Prefs.read(Prefs.java:192) ~[Vengine.jar:na]
at VASSAL.preferences.Prefs.(Prefs.java:74) ~[Vengine.jar:na]
at VASSAL.preferences.Prefs.getGlobalPrefs(Prefs.java:271) ~[Vengine.jar:na]
at VASSAL.launch.ModuleManager.(ModuleManager.java:352) ~[Vengine.jar:na]
at VASSAL.launch.ModuleManager.main(ModuleManager.java:183) ~[Vengine.jar:na]

Thus spake jcbeard:

VASSAL.launch.ModuleManager - Manager
2015-06-28 14:57:23,144 [0-main] ERROR VASSAL.tools.ErrorDialog -
java.lang.IllegalArgumentException: Malformed \uxxxx encoding.

The problem you’re having is that you somehow got an illegal byte
sequence into the main preferences file, prefs/V_Global. Move it
aside and see if that helps.


J.

Greetings UcKelman:

Many thanks! I am pleased to report that your suggested fix worked great.

Best Regards, Joe