Occasionally during shipping or manufacturing the mounting bushings on the mechanism may become misaligned. This may cause a screeching sound and/or mechanical obstruction is severe cases. Fortunately the issue can be easily resolved without tools.
To check if your table has this issue take a look under the table and identify the 4 orange rubber blocks. They should be horizontal or tilted slightly down towards the center as shown in the first two images below. Alternately they may appear like the third image. To fix this, simply grasp the mechanism plate where the orange block is attached and swivel it till it matches either the first or second image. Repeat this for all 4 mounting blocks.