If instructors are experiencing problems with viewing your Gradebook in Bb in the spreadsheet view, try using the Gradebook Views > View Grades by Item instead.
When you contact the Help Desk to report Gradebook issues, tell them if you had used the Upload from Excel option on the Gradebook Spreadsheet view. I have read a few reports that sometimes uploading a column of grades has created display problems. Remember to keep a hard copy of your graded activities throughout the semester. Each time you post grades to Bb, download the gradebook as an Excel file and keep these copies for the semester. Destroy all extra copies after you have submitted final grades.