Esqueda
Have you been able to resolve the problem ?
Without the drawing more info is needed;
What are the specs for your machine ? What service pack of LDT ? Is the file local or on a network share ? Are all layers thawed and turned on ? How many PS layout tabs are in the drawing ? Try setting the layout regen option to "Regen when switching layouts". Have you tried a repair install of LDT ? Does it happen with all drawings or just this one ? Have you tried auditing the drawing ? Is the missing data actually from an xref ? If you draw a line in MS, can you see it ?......................
And to answer your question, yes LDT 2007 can "handle" a drawing that size. I took an existing drawing that was 6MB in size and used the copy commnad to create 3 duplicates of all enties. Also I imported 15 PS layouts from another drawing. Each layout contains 2 non-rectangular viewports. This bumped the file size up to 25MB. All enties are visible in both MS & PS. Zooming/Panning is a bit slow but works. Just out of curiosity, how long does it take to open and save the drawing ? Mine > Open=25secs Save=12secs.
ACADuser
(2) Dual Core Xeon 3.20GHz (1066MHz FSB)
2GB RAM
Quadro FX 3450/4000 SDI (256MB)
80GB 10,000 RPM HD
Dual Sony 23" Widescreen TFT
XP PRO SP2
LDT 2007 SP2A, RD 2007, SURVEY 2007
ACADuser
Civil 3D 2018, Raster Design 2018
Windows 7 Enterprise
Dell Precision 5810 Workstation
Intel Xeon E5-1630 v3 @ 3.70GHz
32GB RAM, NVIDIA Quadro K2200 4 GB GDDR5
DUAL 27" Dell UltraSharp U2713HM