Crash upon changing opacity after tweaking vertices

[kingooze]

Hi.

Straight to the problem. The software crashes when I changed material opacity after I started tweaking vertices. Error message pops up 'erl.exe stopped responding'.

Steps that lead to the problem:
-added an image plane for model reference (in this case, a flower image, jpeg, 113kb size, dimension 347x346)
-added a cube as model clay
-changed the cube into a flat square face
-cut all the edges by 10
-again, cut all the edges, but now by 2
-started tweaking a few vertices
-change opacity to around 0.3-0.5
-crash

Operating system:
-Windows 8.1 (64bit)
RAM:
-8GB (dual channel)
Processor:
-Intel Core i5-3210M CPU @2.50GHz
Graphics:
-2048MB NVIDIA GeForce 610M
-Intel HD Graphics 4000

Another useful info, I was actually watching a tutorial in youtube while trying to emulate what the youtuber (her name is VscorpianC) did in the video. This is the link to that video:
-https://www.youtube.com/watch?v=PrjzfgP6qUE&index=5&list=PLP3-5QSIC-VcsndQX3HR1hGDFwDbpcOXh
This is the title of that video:
-Wings3D Tutorial - Car Modeling 3D Reference Set Up by VscorpianC

Just started using Wings 3D a couple hours ago and I find this software very useful for 3d modelling beginners such as myself. Managed to model a Super Mario game coin in the first two hours of using the software. A flower was suppose to be my second mini project, but then I encounter this problem. I hope there is a way to settle this because I truly cant wait to continue modelling using this software.