Outlook attachments (.jpg) are half grayed out from any sender

We have a couple workstations that use the same email account. However, on one of the computers the picture attachments that are received from clients come through half gray now. Saving it, or just previewing is makes no difference. The image is always partially grayed out. These are all .jpg images, and it is every time, and from any sender.  This just started within the past week. No settings have been changed on the computer, to my knowledge. And, the corporate firewall config has not been changed. The settings are the same on both of the user's computers running outlook (2010). The windows firewall or antivirus is not causing the issue, as I have confirmed. I have also scanned for malware as well, just to be thorough. I have even deleted the email account in outlook, and reset it up. No change. I saw this issue several years back but do not know what the resolution was at that time. Anybody have an idea? Other users in the office (about 9 others) don't have this issue with their email accounts or outlook attachments. Thank you in advance for your input.