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Hi, I'm experiencing this in 3dsmax 2014. It didn't happened in 2012. I have specified some routes in 3dsmax for saving image, mxs and mxi. The problem is if I untick all of them (so the route remains but greyed out) maxwell still saves (and overwrites) the rendered image (not the mxs or mxi).

Any one else?

Hi, this is probably because of a change we introduced in v2.7.30:

the plugin no longer checks the save file flag, only the existence of the file name

We did this because when the checkbox is ticked, max overwrites the file that Maxwell outputs with the data we give it to display in the rendered frame window. More specifically, it will overwrite EXR and HDR files that have emitters on separate layers or embedded channels with an image that MAX generates and contains only the diffuse channel.
There is no way to temporarily suppress this behavior so the only way we could stop this from happening was to output the file when the Save File checkbox is off in the 3DSMAX render parameters.

Thanks Raduc.

I was lucky I had saved the mxi but this can cause a lot of distress. Two rendered images I had made were overwritten with some previews I launched after.

Is there any fix in sight? I think this shouldn't just stay like that.

Same problem here, please address this, it is a pain with multiple teams over a network, working on the same project. We need the rendered images to be created in the same folder of MXI/MXS, for multiple reasons.

Can you add a path to "Rendered Channels" as you have in MXI and MXS output? We should be able to drive where the output images are created from within 3DS MAX...