yes, it seems that way . usually my images are approved within the hour, at latest by the end of the night. my last 4 submissions sat there for about four/ five days, which is long to me by StockXpert standards.
i then deleted them thinking perharps StockXpert is hinting to me they don't want those images, so rather than get me to lose my 100% approval , they let it wallow ..
another site i am with, do this to me. in some way, i like that, as this is so much better than to say, "oh, this is such an excellent photograph BUT blah blah yukkk!"

i remember of one of my business clienteles who handles his rejections this way too. he is a designer and when he doesn't like to buy any of the things presented,
he will , instead of saying this is no good ... get it away from me, he says to us,"i won't be needing this type of (design) (photos) (....) at this moment!
why else do you have for me that i can buy?"
sheer diplomacy , don't you think? unlike the atilla genghis crudeness !