I have run across a problem which is preventing me from further progress on a job.
When I select some hotspots, no display appears under Properties-Spot/Action Parameters/Target view. This prevents setting a target view or custom view. One member has suggested it is a problem with my video card. I doubt that as I have no other issues with it. But in case that is relevant, I have an ATI Radeon HD 4800 Series with the most up-to-date drivers in a Windows desktop computer running Windows 7 with 8 GB RAM.
See screen shots below.
This screenshot shows no display in that window.
screenshot 1.jpg (123.94 KiB) Viewed 376 times
When this hotspot is selected, a display results with a large grey band down the middle.
screenshot 2.jpg (136.12 KiB) Viewed 376 times
When this hotspot is selected, the display appears normal.
Sounds similar to a problem I am having on OS X but I have issues with the preview box starting tiny and often when it's the right size no pano preview is displayed as per your problem. For me, deselecting the current pano in the drop down list and reselecting it causes the preview window to load properly allowing selection of default and custom views.
Test System Spec: 15" Retina MacBook Pro, 2.7GHz i7, 16GB RAM, 768GB SSD, OS X Yosemite
All the panos were produced in the same way. After initial adjustments in Adobe Lightroom, I used Photomatix for HDR, then PTGui Pro to create the panos. I didn't use Photoshop. #004 was created the same way as the rest.