Are you on the same version of smartview as your coworkers that do not receive this error? In 9.3 I recall this being an issue that SmartView could not refresh protected sheets, but I believe there was a patch in 9.3.3 to correct this.
Is the sheet actually protected that you are trying to refresh? Could it be that your coworkers are using Refresh and you are using Refresh all and a sheet within the workbook is protected?
Ok, couple of things that could cause your problems on that side then. First you would want to ensure your smartview is not disabled in Excel, if it has not been disabled do a find/replace in Excel to fix your links. You would Find "'*hstbar.xla!' and replace it with blank. If for some reason this does not turn out well when it's displayed on here, an alternative way of completing this is selecting Data->Edit Links and changing the source of HsTbar to wherever you installed SmartView, there's a folder called named Bin and within that folder is the HsTbar.xla portion of the Smart View add-in.
That .bas in the knowledge document, would essentially do the find/replace for you, I would be surprised if it worked on a protected sheet. Does manually updating the link using the second method I provided work on the protected sheet? If it does not, I may be out of options for you. To be honest I've always found the way SV works with protected sheets to be a complete pain in the neck, what I've had to do in the past with protected sheets, is create a macro to un-protect the sheet, refresh the file, and re-protect the file. It's not an elegant solution at all, and look forward to hearing back if you have some better luck.
The best bet is to ensure everyone has Smart View installed to the same location, but I've had bad luck with sharepoint still working with this. So if everyone has Smart View installed to C:\Hyperion\SmartView the links should update and work automatically, however 220.127.116.11 changes the default install path to C:\Oracle but the key is a consistent location where smartview is installed.