I use:

Windows 10 Pro 10.0.18363 Build 18363 (Version 1909)
Sweet Home 3D 6.3 64-bit
No installed JRE

...forgot to provide that Info in my initial post.

<r>Hi there,<br/>
<br/>
For a few weeks, I have encountered a problem when editing textures of imported models.<br/>
<br/>
Steps to reproduce:<br/>
<br/>
1. Import faulty model<br/>
2. Modify funriture -> Color and texture -> Modify<br/>
3. Select the faulty texture<br/>
4. CRASH!<br/>
<br ...