Doesn't look like.
Have checked a milestone containing 3 tasks and they are all assigned to a specific workspace, though the milestone itself appears on another workspace as well. The tasks in that milestone only display in the correct workspace, which may indicate that this issue only affects milestones.
So, milestone X, comprised of tasks x1, x2, x3, belongs to workspace Y.
Milestone X also displays (wrongfully) in workspace K.
Tasks x1, x2, x3 only display in workspace Y, as expected.
Could it be a DB mapping issue caused by a fauity upgrade?
Is there a schematic difference in the DB tables between oGoo 1.4 and 1.5?