Today I’ve started rendering again and again, and the counter shows for the pictures and I started seeing the render appear in the viewport, but today I charge something else not even on on the iMac, but on another computer and the rendering seems to stop the recent renders window appears just beside the main gray screen, which is the viewport as it is now, and the winters are all gray What the heck is going on I do not understand it are renders happening or am I just waiting my time please advise. Thank you.

Drawn

There isn't enough information to determine what you are attempting to do.  Are you rendering it through Queue Manager on another computer?  What type of scene are you trying to render?  

The more information you can provide, the better we can determine what is happening.

Go to the Window menu and click Recent Renders. That should display everything you had rendered in a while in a separate window. What do you see? That should be your first step.

Then tell us how do you render. What are your steps? Where do you export your renders to? We need that information to help you.

It is a regular type scene, like others I’ve printed all this week. They usually take several hours and I can’t use the msc during that time. I looked up render in background and that suggested I ca n continue to work while rendering so I tried it but as soon as I opene d something else like mail it seemed the render stopped so I tried it again and again a grey screen appeared in viewport and in the recent renders palette. I waited and watched but nothing showed. Now I’d like to stop all background render but it seems ms every abortive render is sent there. I may force close poser tomorrow because that fixed wrong behavior in another app, but I’m open yoTo advice,,is there some way to know if a scene is rendering in the background even if no physical appearance to my eyes?

drawn

Your computer may not have sufficient memory to render AND do something else, and that's why it stops. What are your memory specifications and your graphics card? Grey screen means no rendering was done OR that it rendered but something obstructed the camera and all it saw was a, well, grey wall.

The render command is here, just in case:

You have to select it for the operation to commence. At least you have to do that on PC.

It seems to be a case of file corruption. If you can still access Poser, please open the log to review its contents. This will show you where the rendering issue occurred. As Rhia mentioned, the complexity of the scene may have caused Poser to halt. In such a case, close Poser and restart your system.

If you're relying on the Render Cache as a "save" then you absolutely are losing renders. The Render Cache (Recent renders) is a CACHE. It only keeps the most recent renders. After a number of renders, set in General Preferences, the oldest renders are removed. You have to deliberately save the image.

Right click the image in recent renders and choose "Export Image"

(As with all things Poser there's a bunch of ways to export the image. This is just one of them)

Only then is the image truly saved.