Here's something I have found that can cause problems - having more than one instance of the hap_temp folder existing on your PC. This is not specifically to do with Hap Explorer, but more to do with the general operation of the Haptek Player. This problem means Hap Explorer may not be refering to the current instance of the folder. In turn this means switches, parameters and other things to do with the loaded model will not be displayed - because they are actually in some other hap_temp folder.
The reason for this is that the Haptek Player can sometimes switch to another filing position/path to create the hap_temp folder. I have found it appearing both in the Haptek program directory and also in my Applications Data folder (in Documents and Settings but by default hidden.) Occasionally also the hap_temp player does not delete itself as it should - this also seems to affect the chosen path and appears to lead the existence of more than one of these folders.
Here's what I do to rectify this sometimes:
Close down any programs using the Haptek Player eg, HapExplorer, Internet page, UltraHal.
Search for every instance of hap_temp - there will likely only be one or two of them, if any at all.*
Delete those folders and restart your application.
This forces a fresh instance of the hap_temp folder.
Locate the fresh hap_temp folder - the path to this folder is the one you want to use in Hap Explorer.
*Note: you will need to specify the search to include hidden files and folders.
This doesn't always happen if programs run ok, but sometimes it seems if an application crashes, the hap_temp folder doesn't get deleted as it should - this in turn means it gets chock full of old files. So to summarise, the ideal situation is a hap_temp folder that deletes itself when the application closes and re-appears on the next occasion the program is used. This is the correct way the hap_temp folder should be working.
Hopefully Hap Explorer is not crashing and causing this as I did a lot of work with error handling, but other programs or instances I can not be so sure of.