I discovered that CS6 runs a lot faster (for this "tall and thin" file) if I change the Preferences/Performance/Cache Tile Size to 128K instead of the default 1024K. It would be nice if Photoshop could configure the cache properties on the fly based on the latest file that the user works on. As it is, I'll need to change this value and restart PS when working on a "tall and thin" file versus large digital photos. Of course, I'm not familiar with the challenges of implementing this feature, but I'd assume many PS users switch between these types of files regularly.

The missing layers are there, but not being displayed. They are solid-color filled layers (with paths). Here is an image of the layers panel from CS5 (left) and CS6 (right).

The layers titled "Shape 7 copy" and "Shape 7" do show in CS5, but don't show in CS6. However, "Shape 16" and "teal bar" do appear in both CS5 and CS6 (they're the same type of solid color-fill layer). On the paths panel, the non-showing layers have blank "shape paths" (but those that show have the expected paths). So it looks like CS6 didn't properly import the paths for these particular color-fill layers.

Does anyone know why this is and/or how to fix it (besides recreating the layers)?

Thanks!

The problem is that those color-fill shape layers don't display on the canvas/page at all in CS6, and they do in CS5 (even if I toggle the visiblity a few times). They're part of the design, so it's important. They display fine in CS5.

CS6 probably doesn't display them because it drops the color-fill layer's vector shape upon opening the file.

I wouldn't want to send our clients' assets out. But I have more clues:

In trying to remove the idenitity information in the file enough to be able to share, in CS5, I deleted all the layers in the stack above those shown in my sample (about 90% of the file). After saving it and opening it in CS6, all the color-fill shapes appear on the canvas just fine (and the paths appear in the paths panel and on the canvas).

If I first open the file in CS6, and do the same: delete all layers in the stack above those shown in my sample, those same color fill shape layers don't show on the canvas and the paths are missing.

Therefore, in this case, when CS6 has a big stack of layers to open, it drops some of the paths from these color-fill layers.

Understood. We'll have to wait until someone else with a "tall" file with color-fill paths chimes in with the same issue.

To sum up this thread:

• CS6 Defaults to a Cache Tile Size (Preferences/Performance/Cache Tile Size) of 1024K whereas CS5 defaulted to 128K -- this will bog down opening and working with "tall" files with a lot of layers.
• In some cases, CS6 will improperly import or drop color-fill layer paths upon opening a CS5.5 (or earlier) PS file. In my case, it was a web comp file with hundreds of layers.