Your environment variable could be modified by a shell command like
export LD_LIBRARY_PATH = $LD_LIBRARY_PATH: /yournewpath
With some versions of Vtune, I found that the way to do this was to incorporate the environment variable settings in a script which does that and runs your test application. The settings in the dialog box didn't carry across multiple event gathering sessions.
Regarding Excel*, there are two ways to export data, one is from the embedded Excel worksheet. This sounds like what you have been doing. The other way is to use the File -> Export menu item. This allows you to export the data to a CSV file for importing into Excel later. Note: this item is only available when viewing the sampling data in "Table" view. To change to table view, right-click in the chart and select "View as -> Table".
The embedded Excel worksheet can be problemmatic. My recommendation is to never run Excel outside of the analyzer when using the embedded worksheet. And, use File -> Export whenever possible.