Number of images limited. After limit, only a place marker is created.

[Lloyd-H1]

After converting around 1,000 WMF images (I am guessing at the number) to PNG images, the program starts creating a place marker with no images written. I had been opening directories with WMF images and converting all of the WMF images. I have about 100,000 of these old WMF images. I had converted about 30 directories of these images when I noticed that images were no longer being written. I had attempted to convert 4 more directories of WMF files when I noticed this.

Closing and restarting the program is no help. Upon restarting the program it continues to simply create the place marker without the image.

Using Converseen v. 9.6.2 Ubuntu Studio 18.04

Here is what a converted directory of these old clip art images should look like: