This may be related to a shortage of memory resources; the clip is cut and the clips before and aft are removed, but the clip will not budget from that spot in the timeline. It can be moved to other tracks, but not forward or back in time. A work-around is to use the shift feature and estimate the number of seconds to move the clip positive or negative.
ProblemType: Bug
DistroRelease: Ubuntu 13.10
Package: openshot 1.4.3-1
ProcVersionSignature: Ubuntu 3.11.0-13.20-generic 3.11.6
Uname: Linux 3.11.0-13-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.12.5-0ubuntu2.1
Architecture: amd64
Date: Sun Nov 24 19:25:27 2013
InstallationDate: Installed on 2012-04-27 (576 days ago)
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release amd64 (20120425)
MarkForUpload: True
PackageArchitecture: all
ProcEnviron:
LANGUAGE=en_CA:en
PATH=(custom, no user)
XDG_RUNTIME_DIR=<set>
LANG=en_CA.UTF-8
SHELL=/bin/bash
SourcePackage: openshot
UpgradeStatus: Upgraded to saucy on 2013-10-22 (33 days ago)
[Expired for openshot (Ubuntu) because there has been no activity for 60 days.]