After Effects 2017 play preview problem

[katriinacao]

im having a weird problem while previewing. I circled the part that doesnt load whenever i preview my video. This was never a problem before so im not sure why this is happening. Everytime i preview my video, the end of it never loads. Please help im very confused. 

[Mylenium]

Nothing wrong there. You seriously need to educate yourself about how AE previews work. As per your screenshot you simply don't have enough memory for a full RAM preview. As to why you think this is wrong or why it may have worked differently before we cannot know. You have not offered any info about your Mac's specs or your preview settings.

Mylenium

[katriinacao]

oh. well thanks anyways. The reason why i came here was to learn about AE previews. Not sure why you had to say it like that but alright.