Hi there,

as you are posting in this section, I am assuming that the question is related with the Professional PC version.

This issue is not a bug => it is related with your computer video card.

Try this: in your Punch program => Go to => Edit => Preferences => System => Graphics => Hardware Acceleration. By default, the level of the accelerations is "Full" => Move the control to the center and see if your issue is solved. If not, move the control to the left (None) => check if your issue is solved.

There are few tricks to apply the textures
1 - Try to set the position of the little man close to the surface you wish to apply texture or color, however, you don't need to be on the floor to texture a floor, for example. If there are not interferences, you can even apply a texture from the chopper.
2 - If the element elevation is under the 0.00" level--> the little man elevation must be also below the 0.00" level.
3 - Doors and windows-->apply the color / texture on the surfaces parallel with the wall where the door / window is installed.

Punch, as any program, has a learning curve. The best way to learn the program, IMO, is practice + practice + practice => Read and follow the manual (this is important), see the videos => try to create elements not related with your project, so you will become familiar with the commands and how to develop the different components.
You will find free tutorials in my Website and Facebook page
If you are interested, I have several training e-books, one of them is free. See link to my eBooks page below, in my signature.

Hope this helps.