Filter Forge 7 always crashes with 4k pictures

Hi,

I try to process several 4096X4096 pictures with filter forge 7, and after 4 or 5 minutes of processing, each time, I get the following crash report from Filter Forge.

This crash happens evrytime, with the 3 filters I have tested:

Crayon Master v2 (the most important for me)
Perfect Pastels
Gouache

It crashes with both standalone version and also Photoshop plugin (Photoshop CC 2018), and also with Filter Forge 6 (standalone and photoshop version).

My configuration is following:

Windows 10 64 bits
32 GB RAM (FilterForge is tuned to be able to use 80% of RAM available)
Core i7 3770K

When the crash happens, I can see filterforge 7 is using around 9700 MB of RAM (plenty more available because I have 32 GB).

The filters and FF7 are working fine with 1024 pixels pictures but it's too small for my needs.

Here is the crash report from FF7:

*******************************************************************************************************************

Operating system: Windows 8 x64 Edition (6.2 build 9200)
Physical memory: 32715 MB
Number of processors: 8, available: 8
Processor info: , ~0 MHz

Filter Forge x64 7.006.46116.18450 Release, December 21, 2017 09:40 [07/02/2018 09:21:03 Paris, Madrid]
Exception reported at thread 0000000000003CE4 'RenderingMgr 0000000011407350/7':
<class XFW::Kernel::SystemException> Access violation at address 00000001408D9F57 (read at address FFFFFFFFFFFFFFF8).

[FFXLib::RenderingManager] Rendering storage: <class FFX::PreviewRenderingStorage>@000000006ED2EC48

[FFXLib::RenderingManager] Failed rendering block dump:
Block origin: 762;494
Root component: result
Sampling source component: result
Progressive pass: 0

Exception caught at thread 0000000000003E8C 'Application':
<class XFW::Kernel::SystemException> Access violation at address 00000001408D9F57 (read at address FFFFFFFFFFFFFFF8).

Some more informations I have noticed:

On the Mac version, there is no crash, even with 8k pictures ! My iMac has only 8 GB of RAM but Filter Forge 7 and crayon master v2 are working fine, even on very large picture.

The crash doesn't happen with the command line tool on Windows. Once again, the tool worked fine even on 8K pictures with crayon master filter.