Mari - problem painting

hey everyone. I'm having a problem with Mari. though it runs alright, painting is giving me odd results.
when I paint, the brush reacts well to the surface\UV (image 1), but when I apply the buffer, I'm getting weird results, as if the UVs are wrong or as if the paint scattered (image 2).

I know my specs probably don't stand up to the minimum requirements. also, when I launch Mari, I receive a warning message saying my graphics card has not been tested with mari and may cause the program to not work properly. but I wanted to check first maybe there's a solution and maybe it's not a hardware issue.

my specs:
* AMD Phenom II X4 925 processor 2.80GHz
* 50GB (of 1TB) disk space available for caching
*4GB RAM
*ATI Radeon HD 4800

mari minimum requires:

• Quad-core processor
• 250GB disk space available for caching and temporary files (or a
minimum of 50GB if you're working on a small project)
• At least 4GB RAM
• An NVIDIA or AMD graphics card with at least 1GB of RAM and OpenGL

image 1


image 2

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