  We investigate the high-speed ($v >$ 1000 km s$^{-1}$) extreme-ultraviolet
(EUV) wave associated with an X1.2 flare and coronal mass ejection (CME) from
NOAA active region 11283 on 2011 September 6 (SOL2011-09-06T22:12). This EUV
wave features peculiar on-disk signatures, in particular we observe an
intermittent "disappearance" of the front for 120 s in SDO/AIA 171, 193, 211
{\AA} data, whereas the 335 {\AA} filter, sensitive to hotter plasmas
(T$\sim$2.5 MK), shows a continuous evolution of the wave front. The eruption
was also accompanied by localized coronal dimming regions. We exploit the
multi-point quadrature position of SDO and STEREO-A, to make a thorough
analysis of the EUV wave evolution, with respect to its kinematics and
amplitude evolution and reconstruct the SDO line-of-sight (LOS) direction of
the identified coronal dimming regions in STEREO-A. We show that the observed
intensities of the dimming regions in SDO/AIA depend on the structures that are
lying along their LOS and are the combination of their individual intensities,
e.g. the expanding CME body, the enhanced EUV wave and CME front. In this
context, we conclude that the intermittent disappearance of the EUV wave in the
AIA 171, 193, 211 {\AA} filters, which are channels sensitive to plasma with
temperatures below $\sim$2 MK is also caused by such LOS integration effects.
These observations clearly demonstrate that single-view image data provide us
with limited insight to correctly interpret coronal features.
