Note that as of UpSlide V5.2, the Export feature is fixed. In some specific configurations, we fallback to using images in the BMP format, so you may notice a loss of quality. If you want to avoid it, log off, then log in again. Also note that the native Excel "Copy as Image" feature is broken regardless of the version of UpSlide.
Description of the problem:
Since Windows 8, when a change in the primary monitor's scaling occurs, some of Windows features stop behaving properly until you log off/log in.
In particular, the "Copy as Image" native feature of Excel is likely to yield strange results after pasting within PowerPoint or anywhere else. The pasted shape can appear cropped on the bottom-right corner, or with a large white border on the same corner, as shown below:
Since UpSlide leverages this feature for its Link feature, the exports you make will also be impacted.
On Windows 8:
You encounter this bug (for some specific hardware configurations) when you connect a second screen to your computer, make it the principal display, and unplug it.
Unplugging makes the first display the main one, but Ms Office keeps reference to the old one to compute the enhanced meta file used to export.
On Windows 10:
Simply changing the scaling of the primary monitor will cause the issue.
Sign out of your windows session and sign back in.