Thank you, Clyde;

I checked the setting of links manager as you mentioned, there is no difference. And when adding a new category, I do can browse pictures on my local computer, but after clicking the save botton, the picture can NOT be upload. On the right-hand side of MOD, there is indication "Image doesn't exist".

When I installed the Links Manager SQL, 7 SQL queries could not be excuted and indicated these queries existed. Is there anything problem with my installation? (Before installing this contribution, I have installed other MODs)

Thanks!