Here is one comment posted recently :
"I am having some trouble with sharing files.
If I pass my file to a co-worker who has installed the add-in,all the formulas fail to work and checking them , cell formula changed to :
='C:\Documents and Settings\myusername\ApplicationData\Microsoft\AddIns\Sparklines_3.2.2.RNO.xla'!linechart('PI Data2'!I11:I299,,0,150,G13/24)"
The first versions of sparklines were Excel files that could be used as templates, with the advantage that the VBA code was embedded into the file, so no problem to share those files.
This no longer the case with add-ins.
The *.xla file, containing the code is saved in your add-in library, which location changes for each different user :C:\Documents and Settings\myusername\ApplicationData\Microsoft\AddIns\
To solve this, the add-in release I just posted (3.2.3 for XL2003 + 3.2.6 for XL2000) will now be installed in C:\Program files\Sparklines... and nowhere else !
This should satisfy many users, but I already can hear "I am working wit Citrix", "I have not admin rights, I cannot install anything on C:"... one step at a time, we'll address that later.
PS : Remember to uninstall the previous versions of the add-in (last option of the Sparklines menu) before installing this new release.
PS2 : I'll be off-line for 2 weeks... absolutely unreachable (yes, it is still possible !), mountain climbing in Argentina between Mount Incahuasi (6.610m) and Pissis (6.795m)... see ya!