I'm recently facing a problem in InDesign after updating to version CC 188.8.131.52.
When I export a PDF for Printing the file is 20 MB, whereas in previous versions these files were only 1 Mb. Has anything changed in this version or is this a bug?
A 20 Mb pdf file is quite small for printing. But as you expected a 1Mb file I gess you need to review your pdf export settings.
If you need a small file just configure the pdf settings to compress the images or resample them.
Possibly using different export settings? In any case 20 Mb sounds better than 1 Mb if you need to print this, since a larger PDF of the same content probably means better resolution.