MuseScore crash and weird behaviour on deleting 4 staves

The following photos are taken in the exact order of the file names. I first selected a row that I wanted to delete, then deleted it, then tried ctrl-z and the weird stuff started happening. It gets even weirder with the other example for which I didn't provide the first 3 steps because they are so easy. I am running Nightly 2244 on Windows 7 RC 32-bit. Please if you can guys, fix this because it is kind of annoying. MuseScore seems to handle smaller numbers of measures with 4 staves pretty well, but when the numbers grow, it causes this ugly GUI glitch, and, if you try to delete those visual artifacts that are left over, MuseScore will crash, or, a sure way to crash it is to redo after you tried undo with ctrl-z in order to undo the deletion. That will crash MuseScore for sure alongside the following error messages:

---------------------------
Microsoft Visual C++ Runtime Library
---------------------------

This application has requested the Runtime to terminate it in an unusual way.
Please contact the application's support team for more information.

---------------------------
OK
---------------------------

Problem signature:
Problem Event Name: APPCRASH
Application Name: nightly.exe
Application Version: 0.0.0.0
Application Timestamp: 4adfa2bb
Fault Module Name: nightly.exe
Fault Module Version: 0.0.0.0
Fault Module Timestamp: 4adfa2bb
Exception Code: 40000015
Exception Offset: 00108071
OS Version: 6.1.7100.2.0.0.256.1
Locale ID: 1048
Additional Information 1: 67b5
Additional Information 2: 67b58c24656bc42f88be5a419f332a6f
Additional Information 3: cd7a
Additional Information 4: cd7afa7d172b9817400bd02171f8b524

Read our privacy statement online:
http://go.microsoft.com/fwlink/?linkid=104288&clcid=0x0409

If the online privacy statement is not available, please read our privacy statement offline:
C:\Windows\system32\en-US\erofflps.txt