I'll use bryce 5 and later 5.5 for almost 3 years now. I'll never experienst problems with it. But at the moment am i working at a mor complex scene, with a lot of groups, metabals and terains. No problems so far. But if I wish to import someting from the object libery (no differents betwees a roundedged cube or a viccy with clothes and hair) or from .obj, bryce give a message that it crashed. In a clean document there is no problem, but in the scene

Today I notised that bryce 6 is on sale 1 day only at DAZ. If I'll spend this $20, is this problem sloved, or shoud i'll give up this project?

Sounds like you've pushed the memory and system swap file beyond it's capacity.

You can load a large amount of procedural textures (applied to primatives),and even though Metaballs take a considerably longer time to render because of their design to mix the materials applied to them, the memory load isn't maxed out.

Once you import an object that has large/Hi res textures(with bump/texture mapping), Bryce adds all of those into the file size, and configures the mapping. This requires lots of memory.
Not sure if upgrading would solve this issue. Doubtful in my opinion. I can Crash any version of Bryce by overloading the memory buffer.

Have you tried creating a second file with the Vicky and then merging the two files?

There are other methods to workaround this scenario.

 - Loading the V-OBJ with no materials, and then adding them manually, saving the file as you go. Inevitably your Bryce may crash once it has exhausted the memory and swap capacity of your system.

 - Rendering two seperate images with the same enviromental settings, creating alpha mask renders and combining the seperate files in a 2D enviroment, though you have to be comfortable with creating certain attributes in a 2D form such as shadows and reflections.

 -  Increase the memory in your system, and/or create a larger system swap enviroment with a larger Hard Drive.

I'm sure others have run into to this situation and can offer some assistance.

Good Luck, Let us know how you make out.
ICM

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Ockham's razor- It's that simple

DOn't only increase the physical memory (RAM), see if you can also increase the virtual memory (swap file size). The default is managed by windows and is about 1.5x to 2x the amount of physical ram, and it might be set to increase ondemand but then again I don't know if that's working reliably. Best is to allocate a 3-4 GB chunk of disk space for the swapfile and leave it at that max size. I think you should not ask the OS to waste any time and resources in finding out if it needs more virtual memory or to allocate more if so. Just give it the max.  Then indeed also get more Ram if you can afford it. It's cheeap, but hey, it's not free, and neither is the gasoline for the trip down to the store.

Tank you for the coments!
The physical memory of my laptop is 1 gig (with I think 3 in total), and in task maneger, it seems to just use 1,16 gig, so i'll dont think I have that memory problem, also because this problem sometimes happens with other things from the libery like the rounded primitives.

But is it worth to spent $20 for bryce 6, or is it better to wait until bryce 7?

Bryce 6 is worth it, but if you plan on using Metaballs, forget it. It always crashes as soon as I add a second metaball to a scene.
Biggest advantage is the use of HDRI in your renders, a big plus if you're after realism.
When you think about what you'd pay for other likewise software, $20 is nothing.
Bryce 7 will not be around for at least a couple more years, if there is a 7 that is. Looks to me like Daz3D have lost interest in it.