Also found in OOO310m19 for Windows Vista.

To reproduce:
1. On a blank spreadsheet disable auto calculation (uncheck Tools - Cells
contents - AutoCalculate);
2. Enter numbers in cells A1 and A2;
3. Select range A3:B3;
4. Press F2 and enter the array formula =transpose(A1:A2) (recall to press Shift
+Ctrl+Enter to tell OOo that's an array formula).

At this point in A2:B3 we should see the transpose of A1:A2 but instead we see 
blanks. However the formula content is still there, only the values are not 
shown in the sheet. If you press now F9 you will get the values.

One more exercise:

5. Change content of A2;
6. Select range A3:B3;
7. Press F2 followed by Left Arrow and Shift+Ctrl+Enter (to force OOo to 
recalculate only this formula).

Again, values of A3:B3 disappear. Press F9 to get them.

Remarks:
a. It does not seem to be a transpose issue since it happens to any function 
including scalar ones (e.g. sum). The only requirement seems to be finishing 
the editing with Shift+Ctrl+Enter.
b. Thanks to one add-in function of mine which logs every call I could see that 
the function is not called after the editing.

Given a. and b. I guess this is an editing issue.