I develop a commercial plugin for Photoshop, last weekend I had a few clients update their Photoshop CS6 (Mac) to 13.0.1. Once they did this, the plugin is no longer is listed in the Window > Extension list.
I then updated my Photoshop CS6 to 13.0.1, and tried to debug using Creative Suite Extension Builder 2.0. The extension never shows up and I cannot open it.
What version range does your CS Extension manifest show? If it has a range:
<host Name="PHSP" Version="[13.0,13.0]" />
try changing this to:
<host Name="PHSP" Version="13.0" />
This will ensure that your extension supports a minimum of version 13.0
I suspect that the HostList entry in the extension manifest is limiting the upper bound of the Photoshop version. Can you try editing your manifest like below?
<HostList> <Host Name="PHXS" Version="[13.0,13.9]" /> <Host Name="PHSP" Version="[13.0,13.9]" /> </HostList>
Hope that helps,