Outlook 2010 Signature Changes Size

I've got a user who is having trouble with their emails. Windows 7 Pro SP1, Outlook 2010. Randomly they will receive an email back from a client where the signature has inexplicably changed size. Not the entire signature either, just a piece of it, the address for example, while the name, phone number, fax number etc stay the same size. This doesn't happen with everyone, and it only happens once in awhile. Sometimes days go by before it happens again. My user never sees the change when they hit send, but the people they send mail to, will occasionally see the address go from a size 10 font to a size 30 font. like I said, everything else stays size 10 font in the signature. I tried changing the signature font size and font type but nothing. I can't seem to narrow it down to a specific recipient either.

When the email gets sent it looks normal, but on return it might look like this

Name
SUPER BIG ADDRESS LINE ONE
city, state, zip
logo
email addr
phone number

the client says they receive it like that.

any ideas?

Thanks!
new435Asked:
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Scott CSenior EngineerCommented:
Any add-ins?  Since this happens so sporadically starting Outlook in Safe Mode really isn't an option.

Is this the only user it's happening with?

If so I'd try deleting his Outlook profile and creating a new one.

Be sure to disable all add-ins if there are any.
new435Author Commented:
The profile was my next test, but I was hoping there's something else I could do. It is the only user that its happening to.
Scott CSenior EngineerCommented:
Disable any add-ins and see how that goes.

After that....profile.
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new435Author Commented:
I didn't bother disabling Add-Ins. I rebuilt the profile. We WERE able to narrow it down to a single recipient. That recipient says it only happens when our user sends an email to them occasionally. We will see what happens in the next day or two.
Scott CSenior EngineerCommented:
It might be on that recipient's system then.  I guess if it's a big enough deal your user could do a screen capture of his signature and then use that image as his signature.

A .jpg won't change at all.

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new435Author Commented:
JPG was a great idea. Would have never thought of that. It also happened to another person she sends to. Rebuilding profile didn't fix it, but JPG did the trick.
Scott CSenior EngineerCommented:
Excellent.  Glad I could help.
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