Sometimes people use Hide by Category to hide objects. When another person opens the file they may not realize there are hidden objects in the scene because Unhide All doesn't really Unhide All.

IN MAX2012 ( not tested in 2013 )
When setting up a shortcut for the TV element Mode in the UVW Unwrap UI, the shorcut only works when the edit UVW window isn't active/focused. (so you have to be in the viewport for example to press your shortcut, and then come back to the UVW window)

Also the icon doesn't get updated when a Maxscript toggles the state of the TV element Mode.

Working on PFlow the automated updater can be quite annoying, especially in heavier simulations.

You change a value, bing! wait for the update. The same goes for backward dragging of the time-slider.

Escaping turns off the PFlow, which annoys a lot.

Maybe an option to do update only when previewing from start / doing forward motion ?

now we only have cotton properties !!

for exam : Silk,carpet,Leather and etc

When creating PFlow-Elements the included events are not displayed in the Layer-Dialogue. They also can not be moved and are stuck on some arbitrary layer activated at the time. Therefor can not be turned off by hiding etc. controlled by Layers properly

Make them visible in the layer-dialogue, so you can access them / hide them, etc. OR make them all relate to one "Master"-P-Flow Element ( but then you may generate multiple PFlow's ...

When selecting a large bitmap from the bitmap loading menu, the map should load (perhaps in a mip map fashion) as a small thumbnail preview instead of spending time loading the entire map into memoery and then displaying the map in the preview window. This is especially irritating when I am trying to select a hdr and I have to wait 10-30 seconds for the map to load in the preview window in order to see if that is the map I want to choose.

I have to go to the command pannel too often to switch between modifiers.
I believe it would be nice to have the option of right clicking anywhere on the viewport to have either the command pannel or just the modifier stack under the mouse pointer. That way it would be easy to work on expert mode.

Thanks,
Guido.

The Compositor Link feature creates unnecessary keyframes for objects that don't move. This slows down the import in After Effects and bloats the Project files.
The system should be so smart to detect whether an object is moving over the time range or not.
A further improvement would be a simple function to reduce keys for flat parts in the animation curve.

Each time you create new layer. It will show a dialogue and let you type the name of new layer. But the thing is you "can't Enter Key" to accept without using mouse to click OK button. It's a small annoy thing exactly.

Please let us "Enter Key" to accept without moving the mouse to click.

like Zoom, Pan, Zoom Extents, Zoom Extents Selected, etc

Fix "Select by Name" tooltip so that it matches the "Select by Scene" window that comes up default

now we can't align objects and other things with groups !
align tool did not support groups

Cap Holes Modifier should have a material ID options. Currently there are no options for this, but it should be simple to add this feature to enable Material ID options for the cap and the source.

When using iray as the activeshade renderer in a viewport (which is awesome), you frequently have to close the activeshade preview, then re-launch it for iray/max to re-evaluate the scene.

Simple things like moving lights, objects, etc do not need the scene to be re-evaluated. But altering a light's properties or changing a material does need the activeshade window to be closed, then re-opened, which is slow.

Some control (a button?) which forces the scene to be re-evaluated would be great.

Generate directories that don't exist. When you customize the text path for a render element, it will error out on render if the directory doesn't exist. You have to click on the path icon, create folder, name it, set path. This would be helpful particularly if there are render tokens.

'Tokens' for render output and render elements. Path and filename strings to automate multiple output entries. Strings like 'Scene Name', 'Camera', 'Render Element', etc. That way you could just fill in something like: \GenericProjectName\renders\(sceneName)\(camera)\(renderElement).png - Files would automatically be outputted into folders per render element per camera per project, etc.

Shift-drag duplicating pflow events and emission nodes causes render errors. The solution is to replace the emission node with a new one. This is a pain in the proverbial.

The ability to edit common settings in backburner jobs. Such as change use all servers from on to off.

When manually moving the playback head to the first frame of the timeline it nearly always jumps forward one frame.